for (int i = 0; i < 27; i++) {
      counter2.recordHits(1);
    }
    for (int i = 0; i < 31; i++) {
      counter2.recordLoadSuccess(i);
      totalLoadTime += i;
    }
    for (int i = 0; i < 37; i++) {
      counter2.recordLoadException(i);
      totalLoadTime += i;
    }
    for (int i = 0; i < 41; i++) {
      counter2.recordMisses(1);
    }
    for (int i = 0; i < 43; i++) {

    assertEquals(ImmutableSortedMap.of(2, 0, 4, 0, 6, 0), Maps.subMap(map, Range.closed(2, 6)));
    assertEquals(ImmutableSortedMap.of(4, 0, 6, 0), Maps.subMap(map, Range.closed(3, 7)));
    assertEquals(empty, Maps.subMap(map, Range.closed(20, 30)));

    assertEquals(map, Maps.subMap(map, Range.open(0, 12)));
    assertEquals(ImmutableSortedMap.of(2, 0), Maps.subMap(map, Range.open(0, 4)));

    assertEquals(ImmutableSortedMap.of(2, 0, 4, 0, 6, 0), Maps.subMap(map, Range.closed(2, 6)));
    assertEquals(ImmutableSortedMap.of(4, 0, 6, 0), Maps.subMap(map, Range.closed(3, 7)));
    assertEquals(empty, Maps.subMap(map, Range.closed(20, 30)));

    assertEquals(map, Maps.subMap(map, Range.open(0, 12)));
    assertEquals(ImmutableSortedMap.of(2, 0), Maps.subMap(map, Range.open(0, 4)));

  }

  public void testRemoveAllFromAboveUpperBound() {
    TreeRangeSet<Integer> rangeSet = TreeRangeSet.create();
    rangeSet.add(Range.closed(3, 6));
    rangeSet.remove(Range.closed(3, 7));
    testInvariants(rangeSet);
    assertThat(rangeSet.asRanges()).isEmpty();
  }

  public void testRemoveAllExtendingBothDirections() {
    TreeRangeSet<Integer> rangeSet = TreeRangeSet.create();